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- /*-
- * Copyright (c) 1990 The Regents of the University of California.
- * All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Chris Torek.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
- #if defined(LIBC_SCCS) && !defined(lint)
- static char sccsid[] = "@(#)funopen.c 5.2 (Berkeley) 2/5/91";
- #endif /* LIBC_SCCS and not lint */
-
- #include <stdio.h>
- #include <errno.h>
- #include "local.h"
-
- FILE *
- funopen(cookie, readfn, writefn, seekfn, closefn)
- const void *cookie;
- int (*readfn)(), (*writefn)();
- #if __STDC__
- fpos_t (*seekfn)(void *cookie, fpos_t off, int whence);
- #else
- fpos_t (*seekfn)();
- #endif
- int (*closefn)();
- {
- register FILE *fp;
- int flags;
-
- if (readfn == NULL) {
- if (writefn == NULL) { /* illegal */
- errno = EINVAL;
- return (NULL);
- } else
- flags = __SWR; /* write only */
- } else {
- if (writefn == NULL)
- flags = __SRD; /* read only */
- else
- flags = __SRW; /* read-write */
- }
- if ((fp = __sfp()) == NULL)
- return (NULL);
- fp->_flags = flags;
- fp->_file = -1;
- fp->_cookie = (void *)cookie;
- fp->_read = readfn;
- fp->_write = writefn;
- fp->_seek = seekfn;
- fp->_close = closefn;
- return (fp);
- }
-